package com.ls.lsbase.utils;

import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.os.Process;
import android.util.Log;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;

/**
 * 异常拦截
 */
public class CrashHandler implements Thread.UncaughtExceptionHandler {
    public static final String TAG = "CrashHandler";
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    private static CrashHandler INSTANCE = new CrashHandler();
    private Context mContext;
    private Map<String, String> infos = new HashMap<>();

    public static CrashHandler getInstance() {
        return INSTANCE;
    }

    public void init(Context context) {
        this.mContext = context;

        this.mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();

        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    public void uncaughtException(Thread thread, Throwable ex) {
        if ((!handleException(ex)) && (this.mDefaultHandler != null)) {
            this.mDefaultHandler.uncaughtException(thread, ex);
        } else {
            try {
                Thread.sleep(500L);
            } catch (InterruptedException e) {
                Log.e("CrashHandler", "error : ", e);
            }

            Process.killProcess(Process.myPid());
            System.exit(0);
        }
    }

    private boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }

        new Thread() {
            public void run() {
                Looper.prepare();
                Toast.makeText(CrashHandler.this.mContext,
                        "很抱歉,程序出现异常,异常已发送,我们尽快修复。", Toast.LENGTH_SHORT).show();
                Looper.loop();
            }
        }.start();

        collectDeviceInfo(this.mContext);

        saveCrashInfo2File(ex);
        return true;
    }

    public void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(),
                    PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null"
                        : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (NameNotFoundException e) {
            Log.e(TAG, "an error occured when collect package info", e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
                Log.d(TAG, field.getName() + " : " + field.get(null));
            } catch (Exception e) {
                Log.e(TAG, "an error occured when collect crash info", e);
            }
        }
    }

    @SuppressWarnings("rawtypes")
    private String saveCrashInfo2File(Throwable ex) {
        StringBuffer sb = new StringBuffer();
        for (Map.Entry entry : this.infos.entrySet()) {
            String key = (String) entry.getKey();
            String value = (String) entry.getValue();
            sb.append(key + "=" + value + "\n");
        }
        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String result = writer.toString();
        sb.append(result);
        try {
            long timestamp = System.currentTimeMillis();
            String fileName = "crash-" + timestamp + "-" + timestamp + ".log";

            if (Environment.getExternalStorageState().equals("mounted")) {
                String path = Environment.getExternalStorageDirectory()
                        + "/crash/";
                File dir = new File(path);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
//                errorMeg = "App name:" + getAppName() + "\nerror message:"
//                        + sb.toString();
                FileOutputStream fos = new FileOutputStream(path + fileName);
                fos.write(sb.toString().getBytes());
                fos.close();
            }
            return fileName;
        } catch (Exception e) {
            Log.e("CrashHandler", "an error occured while writing file...", e);
        }
        return null;
    }

    private String getAppName() {
        ApplicationInfo android = this.mContext.getApplicationInfo();
        return this.mContext.getString(android.labelRes);
    }
}